Why no other Canon lenses with a built-in extender?

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BigBen08 Veteran Member • Posts: 7,170
Why no other Canon lenses with a built-in extender?
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The 200-400 has a built-in 1.4x extender. I have rented this lens 3 times and the quick engage/disengage feature works great.

But I wonder why Canon has not included this feature into other lenses? I know it would increase the lens price, but it may be popular with many photographers.

In fact, I don't know of any camera brand making lenses with an built-in 1.4x

My dream lens is a Canon RF 500 f4 with built-in extender 

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